Control method with fault diagnosis and automatic restoration function for hybrid compensation system

Abstract

The invention discloses a control method with fault diagnosis and automatic restoration functions for a hybrid compensation system. According to the control method for the hybrid compensation system, power grid three-phase currents between an SVG and a TSF group as well as output three-phase currents of the TSF group are regarded as detection objects, voltage and current values acquired by sensors are processed through a controller, the TSFs are controlled to compensate most of reactive power of a load in a graded manner and filter out specific subharmonic waves by using a diagnostic control module, when one of the TSFs fails, the faulty TSF is diagnosed and cut off automatically, and the normal TSFs are reconfigured on demand and put into service, so that the hybrid compensation system has the automatic restoration function; in addition, control parameters of the SVG are obtained according to an instantaneous power theory, so as to achieve continuous compensation of residual reactive power and harmonic waves of the load. The control method ensures stable and reliable operation of the hybrid compensation system in normal and fault states of the TSFs, greatly increases system operating efficiency, and reduces system later-stage maintenance cost. The control method for the hybrid compensation system saves energy, reduces emission, is green and environmentally friendly, has good social and economic benefits, and is particularly suitable to be used in the petroleum drilling field with high damage rate of the TSF due to harsh environment.

Description

technical field [0001] The invention relates to a control method of a high-power reactive power and harmonic dynamic hybrid compensation system, which is used for suppressing power grid harmonics and compensating power grid reactive power, and is especially suitable for oil drilling where the TSF damage rate is high due to harsh environments There are a lot of harmonics and reactive power environments, which belong to the field of power systems. Background technique [0002] With the development of power electronic technology, a large number of power electronic devices have been applied to industrial sites and civil sites. For example, oil drilling rigs, rolling mills, electric arc furnaces, electrified railways, and port cranes in industrial sites, as well as frequency conversion air conditioners, elevators, frequency converters, and medical instruments in civilian sites. Since power electronic devices are nonlinear loads, their grid connection will generate a large amount...

AI Technical Summary

Problems solved by technology

Since the device only detects the load current, the inrush current when the TSC is switched and the specific subharmonic current when it is connected to the grid will flow into the grid and cannot be compensated; also when a certain TSC fails, it will cause the TSC to fail to cooperate correctly with the SVG , so that the whole system collapses, and the load reactive power and harmonics cannot be compensated

[0007] The hybrid compensation systems mentioned above do not have the function of diagnosing the passive compensation devices in the system and optimizing the fault conditions

In the actual field environment, such as oil drilling platforms with harsh environments, a large number of passive compensation devices are often prone to failure, which greatly reduces the stability of the system and increases the maintenance cost of the system

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